package com.mystatusonline.webapp.filter;

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


/**
 * Borrowed from the Display Tag project: http://displaytag.sourceforge.net/xref-test/org/displaytag/filter/MockFilterSupport.html
 *
 * Todo: look into using Spring's MockFilterChain: http://www.springframework.org/docs/api/org/springframework/mock/web/MockFilterChain.html
 */
public class MockFilterChain
  implements FilterChain {

  private final Log log = LogFactory.getLog(MockFilterChain.class);
  private String forwardURL;

  public void doFilter(ServletRequest request, ServletResponse response)
    throws IOException, ServletException {
    String uri = ((HttpServletRequest)request).getRequestURI();
    String requestContext = ((HttpServletRequest)request).getContextPath();

    if (StringUtils.isNotEmpty(requestContext) &&
        uri.startsWith(requestContext)) {
      uri = uri.substring(requestContext.length());
    }

    this.forwardURL = uri;
    log.debug("Forwarding to: " + uri);

    RequestDispatcher dispatcher = request.getRequestDispatcher(uri);
    dispatcher.forward(request, response);
  }

  public String getForwardURL() {
    return this.forwardURL;
  }
}